Home/CVE/An out-of-bounds heap read in Busybox's unlzma applet leads to information leak and denial of service when crafted LZMA-
CVE

CVE-2021-42374

An out-of-bounds heap read in Busybox's unlzma applet leads to information leak and denial of service when crafted LZMA-

An out-of-bounds heap read in Busybox's unlzma applet leads to information leak and denial of service when crafted LZMA-compressed input is decompressed. This can be triggered by any applet/format that.

MEDIUM · CVSS 5.3 EPSS 0.00064
Schedule remediation
  • Public exploit or PoC is available
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-125Out-of-bounds Read
CWE-125Out-of-bounds Read
▤

Affected Products & Versions

12
busybox>= 1.27.0 and <= 1.33.1
fedoraproject fedoraall versions
netapp cloud backupall versions
netapp hci management nodeall versions
netapp solidfireall versions
netapp h300s firmwareall versions
netapp h500s firmwareall versions
netapp h700s firmwareall versions
⚠

Public Exploits & PoCs

1
pocjfrog.com · unboxing-busybox-14-new-vulnerabilities-uncovered-by-clar...jfrog.com
▣

Scoring & Timeline

5.3
MEDIUM · CVSS v3.1 · reefs@jfrog.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD15 Nov 2021 · 09:15 PM
CVSS VectorCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:H
SSVC triage · cisa-vulnrichment
Exploitation
poc
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

15
siemens-csafSSA-942865
siemens-csafSSA-831302
siemens-csafSSA-419740
siemens-csafSSA-565386
suse-csafSUSE-SU-2022:4253-1
🔗

References & Sources

5
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://claroty.com/team82/research/unboxing-busybox-14-vulnerabilities-uncovered-by-claroty-jfrog
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6T2TURBYYJGBMQTTN2DSOAIQGP7WCPGV/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQXGOGWBIYWOIVXJVRKHZR34UMEHQBXS/
https://security.netapp.com/advisory/ntap-20211223-0002/Third Party Advisory
https://lists.debian.org/debian-lts-announce/2025/01/msg00012.html
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